Rocker arm stud drilling and pinning kit

ABSTRACT

The invention comprises a kit for drilling and pinning press on type rocker arm studs to the mounting bosses of an engine head. The kit has an alignment block which fits over the mounting stud and is held thereon by a nut. The block has a depending block portion with a horizontal bore therethrough which aligns with the mounting boss and stud so that the horizontal bore provides a guideway for a drill bit to drill centrally through the mounting boss and stud. A pin may be inserted in the bored hole to lock the stud and boss together.

United States Patent Haselmo 51 Jan.30, 1973 ROCKER ARM STUD DRILLING AND PINNING KIT Primary Examiner-Andrew R. Juhasz Assistant Examiner'Z. R. Bilinsky Attorney-Robert E. Kleve [57] ABSTRACT The invention comprises a kit for drilling and pinning press on type rocker arm studs to the mounting bosses of an engine head. The kit has an alignment block which fits over the mounting stud and is held thereon by a nut. The block has a depending block portion with a horizontal bore therethrough which aligns with the mounting boss and stud so that the horizontal bore provides a guideway for a drill bit to drill centrally through the mounting boss and stud. A pin may be inserted in the bored hole to lock the stud and boss together.

2 Claims, 6 Drawing Figures PATENTED JAN 3 0 I975 INVENTOR ROBERT D. HASELMO *jmmfKQ-fi- FIVG.4.

ATTORNEY ROCKER ARM STUD DRILLING AND PINNING KIT This invention relates to rocker arm mountings in engines, more particularly, the invention relates to tools for mounting rocker arm studs in engines.

It is an object of the invention to provide a novel tool for drilling and press-on type rocker arm studs to the head of an engine.

It is another object of the invention to provide a novel too] for rapidly and accurately mounting and pinning rocker arm stud of the press-in type to the boss of the head of an engine.

It is a further object of the invention to provide a novel tool for pinning rocker arm studs of the press-in type to the rocker arm head which can be easily and accurately operated and which is adapted to 4, 6, and 8 cylinder engines of cars and tracks.

Further objects and advantages of the invention will become apparent as the description proceeds and when taken in conjunction with the accompanying drawing wherein:

FIG. 1 is a perspective view of an engine head with the alignment block of the tool invention mounted onto a rocker arm stud.

FIG. 2 is a side elevational view of the alignment block of the tool invention with the alignment block operatively mounted over a press in type rocker armstud for drilling and pinning the press-in type stud to the mounting boss.

FIG. 3 is a front elevational view of the alignment tool shown operately mounted and taken along line 3- 3 of FIG. 2.

FIG. 4 is a top plan view taken along line 4-4 of FIG. 2.

FIG. 5 is a side elevational view of the set of bushing for insertion into the alignment block depending upon the size of the press-in type stud.

FIG. 6 is an end view of the pin for pinning the pressin type stud to the mounting boss.

Briefly stated, the invention comprises an alignment tool kit for drilling and pinning a press in type rocker arm stud to a mounting boss. The alignment tool kit comprises an alignment block having a vertical and horizontal bore with the vertical bore for slidably mounting the block onto a rocker arm mounting stud, with a bushing between the stud and the vertical bore to create a snug fit. A bolt is provided for tightening the alignment block onto the stud against the mounting boss with the block in perpendicular alignment with the stud and boss. A drill is employed with a drill bit being of a size to be received in the horizontal bore of the block and with the horizontal bore acting as a guideway for the drill to drill through the center of the mounting boss and stud. Thereafter a pin may be inserted into the bore in the mounting boss and stud to lock the stud in place in the boss.

Referring more particularly to the drawing in FIG. 1, the alignment tool kit 20 which includes an alignment block 21 is illustrated operatively mounted to the rocker arm stud 22 of the head 23 of an engine.

In FIGS. 3, 4, and 5 the operative mounting of the alignment toolkit is shown in more detail. The steel alignment block 21 has a vertical bore 24 which is slidably mounted over the rocker armmounting stud 22. A metal bushing or sleeve 25 is fitted in between the vertical bore 24 between the block and the stud creating a snug fit for the block relative to the stud to maintain the block 21 in perpendicular alignment with the stud as illustrated in FIGS. 3-5, inclusive. The

alignment block 21 has a depending block portion 21-.

The depending block portion 21' has a horizontal bore 26 there through. A nut 27 is threaded onto the stud 22 against the top 28 of the alignment block to lock the alignment block 21 rigidly to the stud, with the upper surface 30 of the mounting boss 30 flush against the underside 29 of the alignment block.

The rocker arm stud 22 is a conventional press-in type with its lower end 22 press fitted onto the socket or bore 31 of the mounting boss 28.

OPERATION When it is desired to drill and pin a press in type mounting stud 22 to its mounting boss 30 of the head 23 of an engine, the operator will slide the bushing 25 onto the mounting stud 22. Thereafter, the alignment block 21 will be slid onto the stud 22 and over the bushing 25 to its position shown in FIGS. 2-4.

The nut 27 will thereupon be threaded onto the stud 22 tight against the upper surface 28 of the alignment block .with the lower surface 29 of the block tight against the tap 30' of the mounting block.

The bushing 25 will have an inside diameter only slightly larger than the outside diameter of the stud, and the outside diameter of the bushing will be only slightly smaller than the inside diameter of the bore of the block, so as to have a snug fitting between the stud and bushing and block, whereby when the nut 27 is tightened on the stud against the block, the alignment block will be perpendicular to the longitudinal axis of the stud 22, and the horizontal bore 26 of the alignment block will be perpendicular to the longitudinal center axis of the stud 22, and longitudinal center axis of the bore 26 will pass through the center of the mounting boss 30 and through the center of the longitudinal axis of the stud 22 with reasonable machine accuracy.

Thereafter, the drill bit 32 will be mounted in a power drill and the drill bit 32 will be inserted into the horizontal bore 26 of the alignment block 21, until the nose of the drill bit 32 abuts against the side of the mounting boss. The power drill will be energized and the drill bit 32 will drill a hole 33 horizontally through the center of the mounting boss and perpendicularly through the center of the stud 22.

The drill bit will be only slightly smaller than the bore 26 of the alignment block, so that the bore 26 will act as a guideway to maintain the drill bit 32 in alignment with the mounting boss 30 and stud 22, so that the hole 33 drilled will pass perpendicularly through the center at the mounting boss 30 and through the center of the stud 22, the bore 26 thereby enabling accurate drilling through the boss and stud.

Thereafter the drill bit 32 will be removed from the bore 33 of the boss and stud, and a conventional pin 34 will be press fitted into the bore 33 until it is aligned centrally in bore, as illustrated in dashed lines and designated by numeral 33.

The pin 34 is of a conventionaltype made of spring steel of a high strength and is formed of a folded strap folded longitudinally as illustrated in FIG. 6, so that it forms a C-shaped cross-section with longitudinal flanges 34' and 34". The flange 34' and 34" will flare outwardly so as to have a slightly larger circumference than the bore 33 in the stud and boss, so that when it is pressed into the bore 33, the flanges by urging outward vided for easily and accurately and rapidly drilling a bore in the rocker arm stud and mounting boss for pinning the stud to the mounting boss. 7

The tool also eliminates the need for laying out and center punching the stud for drilling as has been done in the past.

A second cylindrical bushing or sleeve 35 is also provided. The sleeve 35 has the same outside diameter as the sleeve 25 so as to fit in the alignment block but has a smaller inside diameter 36 so as to fit snugly with smaller rocker arm studs having a smaller outside diameter, slightly smaller than the inside diameter 36. Also, other bushing may be provided to accommodate different size studs.

It will be obvious that various changes and departures may be made without departing from the spirit thereof and accordingly, it is not intended that the invention be limited to that specifically described in the specification or asillustrated in the drawing but only as set forth inthe appended claims wherein;

What is claimed is:

1. A tool kit for'drilling and pinning a press in type rocker arm stud in the stud mounting boss bore of the mounting boss of an engine head, said tool kit comprising an alignment block having a vertical stud receiving bore for receiving the rocker arm stud, a nut threaded onto the stud to lock the alignment block to the stud upon the mounting boss, said block having a lateral drill guide bore with the axis .of the drill guide bore intersecting the axis of the stud receiving bore of the block so that when the block is locked onto the stud upon vthe mounting boss the longitudinal axis of the guide bore will pass through the center of the boss and through the center of the longitudinal axis of the stud, a drill bit for insertion into the guide bore with the guide bore guiding the drill to drill a hole through the center of the mounting boss and through the center of the stud to provide a bore for insertion of a pin to lock the stud to the mounting boss;

2. A tool kit for drilling and pinning a press in type rocker arm stud in the stud mounting boss bore of the mounting boss of an engine, said tool kit comprising an alignment block having a vertical stud receiving bore for receiving the rocker arm stud, a nut threaded onto the stud upon the mounting boss, said block having a lateral drill guide bore with the axis of the drill guide bore directed laterally toward the axis of the stud receiving bore, so that when the block is locked onto the stud upon the mounting boss the longitudinal axis of the guide. bore will pass centrally into the mounting boss and into the stud, a drill bit for insertion into the guide bore with the guide bore guiding the drill to drill- 

1. A tool kit for drilling and pinning a press in type rocker arm stud in the stud mounting boss bore of the mounting boss of an engine head, said tool kit comprising an alignment block having a vertical stud receiving bore for receiving the rocker arm stud, a nut threaded onto the stud to lock the alignment block to the stud upon the mounting boss, said block having a lateral drill guide bore with the axis of the drill guide bore intersecting the axis of the stud receiving bore of the block so that when the block is locked onto the stud upon the mounting boss the longitudinal axis of the guide bore will pass through the center of the boss and through the center of the longitudinal axis of the stud, a drill bit for insertion into the guide bore with the guide bore guiding the drill to drill a hole through the center of the mounting boss and through the center of the stud to provide a bore for insertion of a pin to lock the stud to the mounting boss.
 1. A tool kit for drilling and pinning a press in type rocker arm stud in the stud mounting boss bore of the mounting boss of an engine head, said tool kit comprising an alignment block having a vertical stud receiving bore for receiving the rocker arm stud, a nut threaded onto the stud to lock the alignment block to the stud upon the mounting boss, said block having a lateral drill guide bore with the axis of the drill guide bore intersecting the axis of the stud receiving bore of the block so that when the block is locked onto the stud upon the mounting boss the longitudinal axis of the guide bore will pass through the center of the boss and through the center of the longitudinal axis of the stud, a drill bit for insertion into the guide bore with the guide bore guiding the drill to drill a hole through the center of the mounting boss and through the center of the stud to provide a bore for insertion of a pin to lock the stud to the mounting boss. 